#!/usr/bin/python3
import json
import sys
import re

from catalog_update.upgrade_strategy import datetime_versioning


RE_STABLE_VERSION = re.compile(r'^(\d+\.){4}\d+$')


def newer_mapping(image_tags):
    key = list(image_tags.keys())[0]
    temp_tags = {t: t for t in image_tags[key] if RE_STABLE_VERSION.fullmatch(t)}
    tags = {}

    # Format tags so they can be parsed by datetime_versioning
    for tag in temp_tags:
        tag = tag.split('.')
        for i in range(len(tag)):
            # Ignore the first two parts as they are supposed to have leading zeros
            if i in [0, 1]:
                continue
            # Add leading zero to single digit numbers
            if len(tag[i]) == 1:
                tag[i] = '0' + tag[i]
        tag = '.'.join(tag)
        tags[tag] = tag

    # Get the latest version
    version = datetime_versioning(list(tags), '%y.%m.%H.%M.%S')
    if not version:
        return {}

    cleanVersion = ""
    # Covert the tag back to the original format
    for idx, part in enumerate(version.split('.')):
        # Ignore the first two parts as they are supposed to have leading zeros
        if idx in [0, 1]:
            cleanVersion += part + '.'
            continue
        if idx == 2:
            # Preserve the trailing zero on third part, but trim the leading zero
            cleanVersion += part.lstrip('0') + '.'
            continue
        if len(part) == 2 and part[0] == '0':
            cleanVersion += part[1] + '.'

    # Remove trailing dot
    cleanVersion = cleanVersion.rstrip('.')

    return {
        'tags': {key: cleanVersion},
        'app_version': cleanVersion,
    }


if __name__ == '__main__':
    try:
        versions_json = json.loads(sys.stdin.read())
    except ValueError:
        raise ValueError('Invalid json specified')

    print(json.dumps(newer_mapping(versions_json)))
